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I disagree completely that the use of any fuel injector or fuel system cleaner is pointless on a direct injection engine. While it is true that you won't get the full effects of an intake valve cleaning because the fuel with the cleaner is not "washing" the intake valves, there is still the matter of keeping the small holes in the injectors clean as possible. Any type of fuel injector or system cleaner will only help in this regard. Using a top tier gasoline will probably keep things clean, but tossing a large bottle of Techron into the tank when filling it for a track day several times a year isn't hurting a darn thing. Even if my injectors are clean, it's just cheap maintenance.
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